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题目描述 给定长度为n的序列｛a｝，求 ∑ i = 1 n ∑ j = i n M a x [ i , j ] ∗ M i n [ i , j ] \sum_{i=1}^{n}\sum_{j=i}^{n}Max[i,j]*Min[i,j] ∑i=1n​∑j=in​Max[i,j]∗Min[i,j] Max和Min为对应区间内的极值html 数据范围 1 ≤ \leq ≤n ≤ \leq ≤ 1e5

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